Method for producing α-hydroxycarboxylate

Details Method for producing α-hydroxycarboxylate Method for producing α-hydroxycarboxylate

2006-10-17

2006-10-17

Zucker, Paul A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

Reexamination Certificate

active

07122698

ABSTRACT:
The present invention provides a process for more efficiently producing an α-hydroxycarboxylic acid ester wherein side reactions due to the α-hydroxycarboxylic acid ester are inhibited or prevented in comparison with prior art production processes.The invention provides a process for producing an α-hydroxycarboxylic acid ester comprising Steps 1 to 3:Step 1. reacting, in the presence of oxygen, (i) a 1,2-diol with a 1,2-diol or (ii) a 1,2-diol with an alcohol to obtain a reaction product containing an α-hydroxycarboxylic acid ester;Step 2. separating the α-hydroxycarboxylic acid ester from the reaction product obtained in Step 1 by distillation under reduced pressure; andStep 3. feeding Step 1 with a mixture obtained by partially or entirely removing water from the reaction product, wherein the mixture contains an unreacted 1,2-diol and/or alcohol.

REFERENCES:
patent: 2003/0060655 (2003-03-01), Hayashi, et al.
patent: 07-173264 (1995-07-01), None
patent: 11-292825 (1999-10-01), None
Lee et al, Pollimo, Synthesis and Polymerization of New Sequentially ordered Aliphatic Ester Diols, 1997, 21 (6), pp. 926-936, CAS Abstract.
Biella et al, Catalysis Today, Application of Gold Catalysts to Selective Liquid Phase Oxidation, 2002, 72, pp. 43-49.

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